import React, { Component } from 'react'

export default class App extends Component {
  state = { count: 100 }
  render() {
    return (
      <div>
        <button onClick = { () => {
          this.setState({
            count: this.state.count +10
          })
        }}>{ this.state.count }</button>
      </div>
    )
  }
}
